/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.streaming.connectors.pulsar.testutils;

import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertEquals;

/**
 * Test results collector.
 */
public class SingletonStreamSink {
    public static final List<String> SINKED_RESULTS = new ArrayList<>();

    public static void clear() {
        SINKED_RESULTS.clear();
    }

    /**
     * Collector sink for string.
     */
    public static final class StringSink<T> extends RichSinkFunction<T> {
        @Override
        public void invoke(T value, Context context) throws Exception {
            synchronized (SINKED_RESULTS) {
                SINKED_RESULTS.add(value.toString());
            }
        }
    }

    public static void compareWithList(List<String> expected) {
        expected.sort(null);
        SingletonStreamSink.SINKED_RESULTS.sort(null);
        assertEquals(expected, SINKED_RESULTS);
    }
}
